AT512157A4 - Device for receiving a ski binding - Google Patents

Abstract

Device (1) for receiving a ski binding (2) and method for producing such a device (1) which can be fastened to the upper side (5) of a ski (4), wherein a binding plate (3) is provided, which is provided with a binding part the ski binding (2) is connectable, wherein the binding plate (3) is connected to at least one casting material (13) in the solidified state, wherein the casting material (13) has a higher density than the material of the binding plate (3).

Description

1

The invention relates to a device for receiving a ski binding, which is attachable to the top of a ski, wherein a binding plate is provided, which is connectable to a binding part of the ski binding, and a method for producing such a device.

Binding plates have long been known and are mainly used to influence the handling characteristics during skiing, especially in sporty driving style. By arranging a binding plate between the ski binding and the ski, the distance between the ski boot and the ski upper side can be increased, whereby the power transmission to the ski edge is improved. In addition, this prevents the ski boot from touching the ground when cornering. A binding plate for holding a two-part ski binding of an alpine ski is known, for example, from EP 0 835 675 A2.

Such binding plates are usually either made of thermoplastic material, preferably glass fiber reinforced thermoplastic material and are therefore very easy to produce by injection molding. Alternatively, plates made of aluminum are used, which, however, must be machined from an aluminum raw profile or from an aluminum raw plate by means of machining technology (milling, drilling, turning, etc.) and are accordingly expensive to manufacture and also limited in the three-dimensional Shaping are.

The binding plates made of thermoplastic material by injection molding are formed on the top, where the binding parts are mounted substantially flat. On the underside, these binding plates are preferably provided with cavities or recesses, on the one hand to keep the weight for the tourist skier limits, on the other hand bonding plates made of thermoplastic material for technical reasons not as a solid plastic block in the injection molding produced (delay by Volumenschwindung, very long Cycle times, stress cracks during cooling, etc.).

In alpine ski racing, in which the weight of the ski and the binding plate play a subordinate role in the sense of comfort, it has been shown that a significant increase in the 2

Mass in the middle region of the ski, which corresponds approximately to the binding area, physical benefits, namely in the way that the moment of inertia around a horizontal axis by the concentration of mass in the ski center increases only slightly, the vibration damping behavior of such a ski is substantially improved ,

In this regard, it is already known years ago, in alpine racing ski in the ski area with metal inserts made of metals with very high specific gravity, such as z, B, lead, tin, bronze, silver, gold, etc. to provide. This is essentially achieved in that substantially parts of the ski core, e.g. may be made of wood or synthetic foam, to be replaced by the above-mentioned metals.

These constructions have the disadvantage that the metal (in particular lead) consists of a semifinished product, e.g. a board must be worked out and thus the production is very complex. Furthermore, it has to be taken into account that screws for fastening binding plates or binding parts are to be provided in the area of the ski center and accordingly the entire strength for absorbing the binding forces has to be realized via the adhesive connection. However, the above-mentioned metals are difficult to bond and thus there is a danger in constructions of this kind that delaminations occur during skiing.

The object of the invention is therefore to provide a device with which the vibration behavior of the ski is improved, at the same time, however, the mentioned disadvantages of a built-in ski body metal insert should be avoided. At the same time an easy to be carried out process for the preparation of the device is to be created with which the driving characteristics of the ski during high-speed skiing further improved.

To solve this problem, the binding plate is at least connected to a cast material in the solidified state, wherein the casting material has a higher density than the material of the binding 3 plate.

According to the invention, therefore, the device comprises at least one element or a section made of a cast material which (in normal conditions, ie temperatures at which the ski is usually used, preferably -40 ° to + 40 °) has a higher mass density compared to the binding plate , The element or the higher-density portion of the device is formed by a solidified casting material, which is preferably accommodated in at least one recess or a cavity of the binding plate. Due to the comparatively heavy casting material, the weight of the device as a whole can be increased without changing the dimensions of the binding plate. In this way - after connection of the device with a ski - the mass in the central region of the ski is significantly increased, whereby the moment of inertia about a horizontal axis by the concentration of mass in the ski center increases only slightly, but at the same time the vibration damping behavior of such a ski is substantially improved. Usually, the device - like a conventional binding plate - bolted to the ski. The risk of delamination of the ski, as in the case of an integration of a metal insert in the ski body, is reliably avoided.

To increase the weight of the binding plate, it is favorable if the density of the casting material in the solidified state is several times, in particular a multiple, higher than the density of the material of the binding plate. In particular, it is favorable if, as cast material, a metal having a melting point < 500 ° C is provided, since on the one hand a significant increase in weight on the other hand given a simple processability.

According to a preferred embodiment of the invention, an alloy comprising tin or lead is provided as cast material, and apart from impurities, the cast material preferably consists essentially entirely of tin or lead. When tin or lead is used as the casting material, the specific gravity of the binding plate in the region of the casting material can be greatly increased. In addition, the weight distribution of the 4th

Device are strongly influenced by relatively small volume areas with casting material.

A cost-effective alternative is given if the casting material is a preferably fine-grained metal elements having matrix of a curable material, in particular epoxy resin is provided. In this case, metal scrap in particular in the form of fine-grained elements in epoxy resin can be provided.

The material of the binding plate is preferably thermoplastic material, preferably polycaprolactam (polyamide 6), provided, which is preferably reinforced with glass fibers, in particular with a volume fraction of between 30 and 60%.

In particular, it is advantageous if the weight of the casting material corresponds at least to the weight of the binding plate, wherein the weight of the casting material is preferably 2 to 3 times the weight of the binding plate. In practice it has been found that, in order to achieve good results with the device, at least a doubling of the weight of the binding plate is required, with particularly good results having been achieved by tripling to quadrupling the weight of the binding plate. This range represents a particularly good compromise between the positive effect of vibration damping and the less positive effect of increasing the mass moment of inertia.

If the at least one recess filled with cast material in the solidified state extends over more than half the height of the binding plate, the extent of the casting material-filled recess in the longitudinal direction of the binding plate can be correspondingly lower in order to bring about a corresponding increase in weight. Thus, advantageously, a comparatively pronounced change in the mass distribution in the longitudinal direction of the binding plate can be achieved.

In order to facilitate the arrangement of the casting material in the recess of the binding plate, it is advantageous if the recess is open in the mounted state of the binding plate in the direction of the top of the ski. The binding plate may, however, also have a recess which is open in each case at its opposite broad sides (closed during the casting process). Furthermore, the casting material may be formed as a separate element and then connected to the binding plate.

In order to be able to adapt the specific weight of the device and the weight distribution in a simple manner to the respective application, it is advantageous if the binding plate has a plurality of filled with cast material in the solidified state recesses, which are formed by preferably wall-shaped separating elements of the binding plate. Accordingly, a binding plate with a plurality of recesses is preferably provided, wherein, depending on the application, all or only individual recesses of the binding plate are filled with casting material.

In order to achieve a larger number of recesses for the casting material with a low material cost, it is advantageous if the wall-shaped separating elements of the binding plate run in a grid pattern between the opposite longitudinal sides of the binding plate. According to a preferred embodiment, the wall-shaped separating elements intersect substantially at right angles.

With regard to a particularly stable embodiment of the device, it is favorable if at least two separating elements of the binding plate run obliquely to the longitudinal sides of the binding plate. Of course, however, various modifications with regard to the design and arrangement of the recesses on the binding plate are conceivable.

In order to shift the weight of the device in a central region between the front and the rear binding part of the ski binding, it is advantageous if the binding plates each have at least one recess filled with casting material in the solidified state adjacent to an end region which can not be connected to the associated binding part of the ski binding exhibit.

The object underlying the invention is further achieved by a method as stated at the outset, in which a recess of the binding plate is filled with a casting material in the liquid state, wherein the casting material in the solidified state has a higher density than the material of the binding plate , With regard to the associated advantages and technical effects, reference is made to the above statements.

The invention will be explained below with reference to exemplary embodiments illustrated in the drawing, to which, however, it should not be restricted. Show:

Figure 1 is a schematic view of a ski with a device according to the invention for receiving a ski binding, which has a partially filled with solidified casting material two-piece binding plate.

Fig. 2 shows schematically a side view of a rectangular binding plate;

Fig. 3 is a sectional view taken along the line ΪΙΙ-ΙΙΙ in Fig. 2;

Fig. 4 is a bottom view of the plate of FIG. 2;

5 is a diagrammatic bottom view of an alternative embodiment of a binding plate having a plurality of recesses, schematically illustrating pouring of liquid casting material into the recesses of the binding plate;

6 shows a vibration image of the ski with a binding plate without casting material;

FIG. 7 shows the oscillation pattern of the same ski as in FIG. 6 with the binding plate with casting material; FIG.

Fig. 8 is a greatly enlarged view of Fig. 6;

FIG. 9 is a greatly enlarged view of FIG. 7; FIG. and

10 Fourier-transformed vibration curves according to FIGS. 6 and 7. FIG

In Fig. 1, a device 1 for receiving a ski binding 2 is shown. The device 1 has a binding plate 3, which is attached to an alpine ski 4. The binding plate 3 is attached to the top 5 of the ski 4. For simplicity, fastening means, such as screws, bushes or adhesive layers with which the binding plate 3 can be attached to the ski 4, are not shown in all figures.

On the underside 6 of the ski 4, a running surface is provided which is bounded on the longitudinal side by ski edges 7. The binding plate 3 is connected to a seen in the direction of the ski tip front binding part 8 of the ski binding 2, with which the toe of a ski boot 9 is fixed. The binding plate 3, which can be formed as shown in two parts, is further connected to a seen in the direction of the ski tip rear binding portion 11 of the ski binding, with which the heel of the ski boot 9 is fixed. Alternatively, a one-piece binding plate 3 may be provided (not shown). The further binding part 11 has an opening device 12 (shown schematically) with which the ski boot 9 is separated from the ski binding 2. The device 1 for receiving the ski binding 2 is arranged between the ski 4 and the ski binding 2, so that the ski boot 9 is arranged at a distance from the top 5 of the ski 4.

1, the device 1 in the embodiment shown extends continuously between the binding parts 8, 11 of the ski binding 2. Alternatively, between the mutually facing narrow sides of the two parts of the binding plate 3, a clearance or a gap may be formed. In the embodiment shown, the binding plate 3 is in contact with the upper side 5 of the ski 4 over its entire length. According to an alternative, not shown embodiment, at least a portion of the binding plates 3 may be partially spaced from the top 5 of the ski 4.

In the rectangular binding plate 3 shown schematically in FIGS. 2 to 4, it can be seen that the binding plate 3 has a cavity or a recess 14, in which casting material 13 is accommodated.

In the exemplary embodiment shown in FIG. 5, the part of a two-part binding plate 3 shown has a plurality of recesses 14 filled with a casting material 13 in the solidified state. The casting material 13 has a significantly higher density compared to the material of the binding plates 3. Hereby advantageously the weight of the device 1 can be increased overall, whereby the vibration behavior of the provided with the device 1 Ski 4 is improved.

5, the filled with casting material 13 in the solidified state recesses 14 of the binding plate 3 are closer to not connectable to the associated binding part 8 of the ski binding 2 end portion 16 of the binding plate as at the opposite, connectable to the binding part 8 of the ski binding 2 End portion 15 of the binding plate 3 is arranged. Accordingly, the other part of the two-part binding plate 3 is formed, so that the weight of the device 1 is concentrated as possible in a central region between the binding parts 8, 11 of the ski binding 2 and thus in the ski center.

As is further apparent from FIG. 5, the recesses 14 of the binding plate 3 filled with casting material in the solidified state are separated by wall-shaped separating elements 19, which are preferably formed integrally with the binding plate 3. In the embodiment shown, the wall-shaped separating elements 19 of the binding plate 3 extend in a grid pattern between the opposite longitudinal sides 20 of the binding plate 3, the wall-shaped separating elements 19 crossing substantially at right angles.

The wall-shaped separating elements 19 of the binding plate 3 are arranged obliquely to the longitudinal sides 20 of the binding plate 3 in the embodiment shown. In addition, a perpendicular to the longitudinal sides 20 extending partition 21 is provided. The recesses 14 are also arranged substantially symmetrically with respect to a plane of symmetry extending centrally between the opposite longitudinal sides 20 of the binding plate 3.

As can also be seen from FIG. 5, the binding plate 3 has mounting openings 23, 23 'for fastening the binding plate 3 to the top 5 of the ski 4. In addition, the binding plate 3 has a fastening opening 24 for attaching the front binding part 8.

5, a liquid casting material 13 'is poured from a reservoir 22 into the downwardly open recesses 14 of the binding plate 3 for the preparation of the binding plate 3. The recesses 14 are preferably substantially completely filled with the liquid casting material 13 ', which subsequently solidifies in the recesses 14.

As further shown in Fig. 5, 3 recesses 25 and at the rear end portion 15 of the binding plate 3 recesses 26 are provided at the front end portion 15 of the binding plate. In the illustrated embodiment of the binding plate 3, the recesses 25, 26 of casting material 13 are free. Alternatively, the recesses 25, 26 corresponding to the recesses 14 may be filled with the casting material 13.

Preferably, the casting material 13 is substantially entirely made of tin or lead (apart from any impurities), so that the density of the casting material 13 in the solidified state is many times higher than the density of conventional plate materials.

On the other hand, known binding plates consist of glass-fiber-reinforced polycaprolactam (polyamide 6) and have e.g. a weight of about 400 g. If recess (s) 14 or the cavity is poured out with tin, a weight of approximately 1,350 g is achieved.

When mounting this binding plate 14 on a conventional giant slalom ski, e.g. in the length of 195cm, obtained with the light bonding plate 3 without casting material, a moment of inertia in the order of about 0.68 kg x mz. The same ski with the device 1 according to the invention, i. a tin filled binding plate 3, however, has a mass moment of inertia of about 0.72 kg x m2. As a result, the moment of inertia increases only by about 6%, since the mass in the middle of the

10 2012/50102 10

Ski 4 is concentrated.

An examination of the vibration behavior of this ski 4 after mounting an accelerometer 27 in the blade area by a blow on the ski seat, shown in Fig. 1 with the arrow P, shows that a free damped oscillation is excited, as for the ski 4 with binding plate. 3 is shown without casting material in Fig. 6. For the same ski 4 with the device 1 according to the invention, i. a tin-filled binding plate 3, however, one obtains the oscillation pattern of FIG. 7.

In the enlarged illustrations according to FIGS. 8 and 9, it can clearly be seen that the ski 4 with the device 1 according to the invention already has an amplitude deviation which is about 25% lower after approximately 0.8 sec. Oscillation period, just like the same ski 4 with binding plate 3 without cast material (see Fig. 8). Furthermore, it can be seen from FIGS. 8 and 9 that the naturally occurring harmonics with the ski 4 with the device 1 according to the invention calm down much earlier than with the ski 4 with binding plate 3 without cast material.

This can also be clearly seen after carrying out a so-called Fourier transformation, as shown in FIG. 10. FIG. 10 shows the Fourier-transformed oscillation curve 28 according to FIG. 6 and the Fourier-transformed curve 29 according to FIG. 7.

Clearly visible is the shift of the natural frequencies of the ski 4 with the device 1 according to the invention downwards or the much stronger damping of the natural frequency amplitudes. Thus, it is clearly apparent in FIG. 10 that the natural frequencies of the fundamental and the first harmonic are still relatively the same, but the amplitude deflection of the ski 4 with the device 1 according to the invention is already lower at these two eigenfrequencies, a shift already from the second harmonic the natural frequency takes place by about 20% down, from the fourth upper vibration in the ski with the device 1 according to the invention virtually no significant amplitude amplitude is more present.

10 2012/50102 11

In practice, it has been shown that in order to achieve particularly good results at least a doubling of the weight of the binding plate 3 is expedient, excellent results are obtained in a tripling to quadrupling the weight. This range represents a particularly good compromise between the positive effect of vibration damping and the less positive effect of increasing the mass moment of inertia.

This ensures that the ski sport still sufficient handling of the ski is allowed, the smoothness but, especially on rough slopes, is significantly increased and thus much faster runtimes can be achieved.

Claims (13)

12. A device (1) for receiving a ski binding (2) which can be fastened to the upper side (5) of a ski (4), wherein a binding plate (3) is provided, which can be connected to a binding part of the ski binding, characterized in that the binding plate (3) is connected at least to a casting material (13) in the solidified state, wherein the casting material (13) has a higher density than the material of the binding plate (3). 2. Device (1) according to claim 1, characterized in that the binding plate has at least one recess (14), in which the casting material (13) is accommodated. 3. Device (1) according to claim 1 or 2, characterized in that the density of the casting material (13) in the solidified state by a multiple, in particular a multiple, higher than the density of the material of the binding plate (3), 4. Device (1) according to one of claims 1 to 3, characterized in that as cast material (13) a metal with a melting point < 500 ° C is provided. 5. Device (1) according to one of claims 1 to 4, characterized in that as cast material (13) is provided an alloy having tin or lead, preferably that the casting material (13), apart from impurities, substantially entirely of tin or Lead persists. 6. Device (1) according to one of claims 1 to 3, characterized in that the casting material (13) is a preferably fine-grained metal elements having matrix of a curable material, in particular epoxy resin is provided. 7. Device (1) according to any one of claims 1 to 6, characterized in that the material of the binding plate (3) thermoplastic, preferably polycaprolactam, is provided, which preferably reinforced with glass fibers, in particular with a volume fraction between 30 and 60% is. 13 Device (1) according to any one of claims 1 to 7, characterized in that the weight of the casting material (13) corresponds at least to the weight of the binding plate (3), the weight of the casting material (13) preferably being 2 to 3. times the weight of the binding plate (3). 9. Device (1) according to one of claims 1 to 8, characterized in that the at least one with casting material (13) in the solidified state filled recess (14) extends over more than half the height of the binding plate (3). 10. Device (1) according to one of claims 1 to 9, characterized in that the recess (14) in the assembled state of the binding plate (3) in the direction of the top of the ski (4) is open. 11. Device (1) according to one of claims 1 to 10, characterized in that the binding plate (3) has a plurality of casting material (13) in the solidified state filled recesses (14), which by preferably wall-shaped separating elements (19) of the binding plate ( 3) are formed. 12. Device (1) according to claim 11, characterized in that the wall-shaped separating elements (19) of the binding plate (3) grid-shaped between the opposite longitudinal sides (20) of the binding plate (3), wherein preferably at least two separating elements (19) of the binding plate (3) extend obliquely to the longitudinal sides (20) of the binding plate (3). 13. A method for producing a device (1) for receiving a ski binding (2), wherein on the top (5) of a ski (4) attachable binding plate (3) is provided, which with a binding part (8) of the ski binding (2 ) is connectable, characterized in that a recess (14) of the binding plate (3) with a casting material (13 ') is filled in the liquid state, wherein the casting material (13) in the solidified state, a higher density than the material of the binding plate (3 ) having.